OSI Detail

Question 1

Layer 1 - Physical

Answer 1

Data type occurs as bits. Cables, Wireless, Hubs, Access Points. No logic or decision-making.

Question 2

Layer 2 - Data Link Layer

Answer 2

Packing bits into frames and transmitting. MAC addresses, flow control. NICS, Bridges, Switches

Question 3

Layer 3 -Network Layer

Answer 3

Concerned with routing and forwarding logical addresses. Protocols and devices, multi-layer switches. IPv4, IPv6, ICMP.

Question 4

Layer 4 - Transport Layer

Answer 4

Dividing line between the upper layers and the lower layers of the OSI model. TCP, UDP, WAN accelerators, load balancers and firewalls

Question 5

Layer 5 - Session Layer

Answer 5

Manages sessions, setting up, maintaining, tearing down. Real-Time Transport Protocol. NetBIOS

Question 6

Layer 6 - Presentation Layer

Answer 6

Data formatting, ASCII, GIFs, JPEG, etc.. Encryption, HTML XML, VIDEO

Question 7

Layer 7 - Application Layer

Answer 7

Lower level apps, file and network transfer, pop3, smtp, http, dns, ssh, snmp

Question 8

Encapsulation

Answer 8

Moving down Layer 7 to 1

Question 9

Decapsulation

Answer 9

Moving up from Layer 1 to 7